accident
area
attention
background
barricade
barrier
black
border
building
caution
construct
construction
crime
cross
danger
design
forbidden
icon
illustration
industrial
isolated
lane
line
perimeter
police
protection
repair
restricted
ribbon
risk
road
safety
scene
security
set
sign
stop
street
strip
stripe
striped
symbol
tape
traffic
under
warning
work
yellow
zone